dangerfile.js

async function checkChangelog() {
    const changelogFile = "CHANGELOG.md";
  
    // Check if skipped
    const skipChangelog =
      danger.github && (danger.github.pr.body + "").includes("#skip-changelog");
  
    if (skipChangelog) {
      return;
    }
  
    // Check if current PR has an entry in changelog
    const changelogContents = await danger.github.utils.fileContents(
      changelogFile
    );
  
    const hasChangelogEntry = RegExp(`#${danger.github.pr.number}\\b`).test(
      changelogContents
    );
  
    if (hasChangelogEntry) {
      return;
    }
  
    // Report missing changelog entry
    fail(
      "Please consider adding a changelog entry for the next release.",
      changelogFile
    );
  
    const prTitleFormatted = danger.github.pr.title
      .split(": ")
      .slice(-1)[0]
      .trim()
      .replace(/\.+$/, "");
  
    markdown(
      `
  ### Instructions and example for changelog
  Please add an entry to \`CHANGELOG.md\` to the "Next" section. Make sure the entry includes this PR's number.
  Example:
  \`\`\`markdown
  ## Next
  - ${prTitleFormatted} ([#${danger.github.pr.number}](${danger.github.pr.html_url}))
  \`\`\`
  If none of the above apply, you can opt out of this check by adding \`#skip-changelog\` to the PR description.`.trim()
    );
  }
  
  async function checkAll() {
    const isDraft = danger.github.pr.mergeable_state === "draft";
  
    if (isDraft) {
      return;
    }
  
    await checkChangelog();
  }
  
  schedule(checkAll);